Safety-scaffold



W. MARSHALL.

SAFETY SCAFFOLD.

APPLICATION FILED AUG- 3|, 1915.

Patented Aug. 22, 1916.

2 SHEETS-SHEET I.

W. MARSHALL.

SAFETY SCAFFOLD.

APPLICATION FILED AUG-131M915.

Patented Aug. 22, 1916.

2 SHEETS-SHEET 2.

WILLIAM MARSHALL, OF BISMARCK, NORTH DAKOTA.

SAFETY-SCAFFOLD.

Specification of Letters Patent.

Patented Aug. 22, 1916.

Application filed August 31, 1915. Serial No. 48,240.

To all whom it may concern:

Be it known that I, WILLIAM .MARSHALL,

a citizen of the United States of America,

residing at Bismarck, in the county of Burleigh and State of North Dakota, have invented certain new and useful Improvements in Safety-scaffolds, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to' a safety scaffold and has for its principal object the production of a scaffold wherein simple and efficient means have been provided for permitting the ready adjustment of the scaffold so as tovary the same according to the height desired, and then retain the scaffold in its desired adjusted position.

Another object of this invention is the production of a safety scaffoldwherein the corner standards are provided with enlarged heads, which are so constructed as to efficiently support the planking and at the same time carry the brace rods in such a manner as to allow the scaffold to be efficiently braced when in operation.

Another object of this invention is the production of a safety scaffold wherein brace rods are provided with threaded ends so as to carry the internally threaded brace yokes for allowing the yokes to easily engage the various portions of the scaffold for bracing the same, and allow the rods to easily disengage the same when it is desired to disassemble or dismount the scaffold.

With these and other objects in view, this invention consists of certain combinations, constructions, and arrangements of parts as will be hereinafter fully described and claimed. I

In the accompanying drawings: Figure 1 is a side elevation of the scaffold as constructed in accordancewith this invention. Fig. 2 is an end elevation of the safety scaffold. Fig. 3 is a section taken on the line 3-3 of Fig. 2. Fig. 4 is an enlarged fragmentary perspective view of the upper end of one of the corner standards, illustrating the construction of the heads formed thereon. .Fig. 5 is a fragmentary sectional view through the head of one of the corner standards, illustrating the manner in which the transversely extending beams are secured.-

Fig. 6 is an enlarged fragmentary sectional view taken at right angles to Fig. 5, illuse trating how the overhanging lips engage the scaffold planking. Fig. 7 is a section taken 011 the line 7-7 of Fig. 2. Fig. 8 is a. side elevation of one of the casters which is adapted to be used in connection with this device. Fig. 9 is a section taken on the line 99 of Fig. 1. Fig. 10 is a section taken on the line 10-1O of Fig. 7 looking in the direction of the arrow.

Referring to the accompanying drawings by numerals it will be seen that each corner standard 1 is provided with a plurality of apertures 2 extending therethrough, these apertures being formed in alinement with each other as clearly shown in Fig. 3, since these corner standards 1 are hollow and are preferably cylindrical in shape as disclosed. Each standard 1 is provided with the slotted upper end 3, from which extends the enlarged head 4. This head 4 is preferably receiving the transversely extending end beam 8. The standards 1, as will be seen by referring particularly to Figs. 1 and 2, are carried 1n pairs at the end of the scaffold so as to allow one standard to be carried at each corner of the scaffold. Therefore, it will be seen that the transversely extending end beam 8 will extend transversely across the scaffold so as to allow its ends to be carried by the heads of the standards 1 at the particular end of the scaffold as shown clearly in Fig. 2.

In order to retain the transversely extending beam 8 in position there is provided a set screw 9, which passes through the upper end 3 of the standard 1, so as to pass through one of the threaded openings 10 formed in the beam 8. From this construction it will be-seen that the beam 8 will hold the standards at one end of the scaffold in parallel spaced relation and, therefore, it is necessary to support the two ends of the scaffold in parallel spaced relation, as shown in Fig. 1. This is accomplished by the provision of the brace rods 11, which are preferably hollow similar to a hollow pipe, which fit within the internally threaded neck 12 of the clamping yokes 13. All of these clamping yokes are formed similar to each other,

as are also the brace rods with the exception of the length of the rods. The yokes 18 are adapted to fit about or straddle the standards 1, and also the heads 4 of the standards 1. The set screws 14 will be passed through the yokes 13 and through the standards 1 for retaining the lower ends of the brace rods in their correct position, while the set screws 15 will pass through the yokes carried by the upper ends of the brace rods 11, and also through the internally threaded openings 6 formed in the heads 4 of the standards 1. It will be seen that by providing the heads 4 with a line of internally threaded openings Gadjacent their lower inner sides by moving the yoke engaging the particular head so as to allow the set screw 15 thereof to pass through any one of these openings the rod will be moved so as to more efficiently brace the scaffold, as it will be drawn more tautly as it is swung in either direction as will be evident by referring to Fig. 1.

In order to more efliciently brace the standards 1 at the ends of the scaffold, a hollow brace rod or'pipe 16 having the openings 17 is used, and is provided with the externally threaded ends 18. The internally threaded neck 12 of the clamping yoke 13 is threaded upon these ends 18, as clearly shown in Fig. 3, so as to allow the yoke to fit upon the side portions of the standards 1,

at which time the set screw 14' may be passed through the yoke 13 and the standard 1 for releasably retaining the end brace in its correct position upon the standards, as shown in Fig. 2. Upwardly extending cross braces are also used, as shown in Fig. 2, and

each brace comprises a short pipe 19 having the usual neck 12 and yoke 13 carried upon each end thereof. WVhen used in connection with these cross braces the yokes of the braces will engage the upper portions of the particular standard 1, while the remaining yoke-will fit about the end beam 8, andafter posltioning the cross brace in this manner set screws 20 may be passed through the yokes 13 and also through the standards 1 and the beam 8 for retaining the particular cross brace in its correct position. A brace of the construction above set forth may also be carried by the lower portions of the standards 1 so' as to engage the cross brace 16, as shown in Fig. 2. By having these braces 19 engaging the standards 1 and the cross braces 16 as well as the beam 8, it will be seen that the standards at the corners of the scaffold will be positively held fromv is positioned thereon. This planking will have its end portions resting upon the transversely extending beams 8, since the upper surface of these beams 8 extend in the same plane as the upper surface 22 of the heads 4. At this time the lip 23 having the overhanging portion 24, which is formed upon each of the heads 4, will fit upon the outer portions of the scaffold planking at each side of the scaffold, as shown clearly in Fig. 2. After the planking 21 has been positioned upon the upper portions of the scaffold so as to allow the overhanging portion 24 of the lip 23 to fit thereover, set screws 25 may be passed through the internally threaded 7 opening 26 of the overhanging portion 24,

so as to pass into the planking 21, thereby positively retaining the planking from slipping. As the scaffold planking at the side portions of the scaffold will be positively held in its correct position by means of the lip and screws, it will be' seen that these outer side plankings will bear upon the inner plankings and will efliciently retain the same in their correct positions .upon the upper portions of the beams 8.

When it is desired to make the safety scaffold unusually high for very high rooms or structures an extension leg 27 is provided, having a sleeve 28 upon its upper end. This sleeve is adapted to fit upon the lower end of standard it will be seen that the standard- Will be raised considerably higher. This leg 27 is provided with a squared internal bore 30, as shown clearly in Fig. 9, so that when desired the shank 31 of the caster 32 maybe passed thereinto as shown in Fig. 7, so as to support the scaffold upon a plurality of casters 32, since a caster is to be positioned upon each extension leg of each standard, whereby the scaffold may be easily moved from place to place as the casters ride upon the supporting surface.

From the foregoing description it will be seen that a very efficient safety scaffold has been produced for plasterers or paper hangers or painters for interior decoration work, wherein the scaffold is so constructed as to allow its height to be very quickly and'easily adjusted as desired, and wherein the yokes carried by the brace bars may be easily rotated upon the threaded portions of these bars so as to slightly shorten the length of the bars when necessary, these yokes being adapted to embrace the side portions of the standards, beams, and other constructions so as to be retained in position by means of the set screws. It will further be seen that the construction of the rods of the standards is such that the end beams will be positively retained in position, while the lips formed upon the heads will engage the scaffold planking so as to prevent the same from moving or falling when the scafiold is in use, while the internally threaded openings formed in the head will permit the easy adjustment of the longitudinal brace bars used in connection therewith. What is claimed is: 1. In a safety scaffold of the class described, the combination of a plurality of corner standards having internally threaded openings, an enlarged head formed integral upon each of said standards at its upper end, each head having an upwardly slanting lower side, said head provided with a line of internally threaded openings adjacent its inner and lower sides, brace rods having clamping yokes embracing the side portions of said standards and said heads, set screws passing through said yokes and through the openings formed in said heads of said standards, whereby said scaffold will be efficiently braced, said openings in said heads being adapted to allow the moving of the yokes engaging the heads, whereby the scali'old may be easily adjusted when desired, and said heads will allow the brace rods to be moved so as to more rigidly brace the scaffold.

2. In a safety scaffold of the class defold may be efliciently braced, said slanting side permitting a great or small adjustment as desired.

3. In a safety scaffold of the class described, the combination of a plurality of vertical standards, a head formed integral upon the upper end of each standard, each head being provided with a squared notch, transversely extending end beams carried by said notches, said beams extending evenly with the upper surface of said heads, an integral lip formed upon each of said heads, each lip being provided with an overhanging portion, scaffold planking carried by said beams upon the upper portions of said heads, whereby said overhanging portions of said lips will fit upon the upper portions of the outer scaffold planking, whereby said planking will be held against lateral displacement.

In testimony whereof I hereunto affix my signature,

WILLIAM MARSHALL. 

